Pfaff 571 Instruction Manual
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Pfaff 571 Instruction Manual

Pfaff 571 Instruction Manual

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Enlarged version
571
574

Instruction Manual

591
This instruction manual applies to machines from the
following serial numbers onwards:
PFAFF
571 # 2574794
PFAFF
574 # 2574796
PFAFF
591 # 2574800
296-12-18 461/002
Betriebsanleitung engl. 01.03

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Summary of Contents for Pfaff 571

  • Page 1: Instruction Manual

    Instruction Manual This instruction manual applies to machines from the following serial numbers onwards: PFAFF 571 # 2574794 PFAFF 574 # 2574796 PFAFF 591 # 2574800 296-12-18 461/002 Betriebsanleitung engl. 01.03...
  • Page 2 This instruction manual applies to all versions and subclasses listed under "Specifications". Reprinting, copying or translation of PFAFF instruction manuals, whether in whole or in part, is not permitted without our prior permission and not without written indication of the source.

  • Page 3: Table Of Contents

    Key for setting stitch length ..................7 - 4 Swing out roller presser ....................7 - 4 Edge trimmer -725/04 for 571 ..................7 - 5 Edge trimmer -725/04 for 574 and 591................. 7 - 6 Edge trimmer -726/05 for 591 ..................7 - 7 Installation and commissioning .................
  • Page 4 Threading the bobbin case / Adjusting the bobbin thread tension ......... 9 - 4 Threading the needle thread and regulating its tension on model 571 and 591 ..... 9 - 5 Threading the needle thread and regulating its tension on model 574 ......9 - 6 Setting the stitch length ....................
  • Page 5 Coupling for roller presser drive .................. 11 - 57 .08.03 Bevel gears for feed wheel drive (on the PFAFF 571 and 574) ........11 - 58 .08.04 Bevel gear play (on the PFAFF 571 and 574) ............... 11 - 59 .08.05...

  • Page 6: Safety

    Safety Safety 1.01 Directives This machine is constructed in accordance with the European regulations contained in the conformity and manufacturer’s declarations. In addition to this Instruction Manual, observe also all generally accepted, statutory and other regulations and legal requirements and all valid environmental protection regulations! The regionally valid regulations of the social insurance society for occupational accidents or other supervisory organisations are to be strictly adhered to! General notes on safety...

  • Page 7: Safety Symbols

    It is the obligation of the user to ensure that none of the safety mechanisms are removed or deactivated. It is the obligation of the user to ensure that only authorized persons operate and work on the machine. Further information can be obtained from your PFAFF agent. 1 - 2...

  • Page 8: Operating And Specialist Personnel

    Safety 1.05 Operating and specialist personnel Operating personnel .05.01 Operating personnel are persons responsible for the equipping, operating and cleaning of the machine as well as taking care of faults arising in the sewing area. The operating personnel is obliged to observe the following points and must: always observe the Notes on Safety in the Instruction Manual! never use any working methods which could limit the level of safety in using the machine!

  • Page 9: Danger

    Safety Danger A working area of 1 meter is to be kept free both in front of and behind the machine while it is in operation so that it is always easily accessible. Never reach into the sewing area while sewing! Danger of injury by the needle! Never leave objects on the table while adjusting the machine settings! Objects can become trapped or be slung away! Danger of injury! Do not operate the machine without support 1! Danger due to top-heavy sewing head!

  • Page 10: Proper Use

    Proper use Proper use The PFAFF 571 is a single needle, high-speed post bed sewing machine (post to the left of the needle) with driven feed wheel and roller presser and synchronized needle. The PFAFF 574 is a two-needle, high-speed post bed sewing machine with driven feed...

  • Page 11: Specifications

    (Noise measurement in accordance with DIN 45 635-48-A-1, ISO 11204, ISO 3744, ISO 4871) PFAFF 571 and 591, model A + B at a speed of 2400 spm.: ......L = 79 dB(A) PFAFF 574, model C at a speed of 1600 spm.: ..........L = 75 dB(A) PFAFF 591, model C at a speed of 1600 spm.: ..........

  • Page 12: Pfaff 571, 574, 591

    134 - 35 15/3 134 - 35 or similar strengths of other types of thread Possible models and subclasses PFAFF 571, 591 Model A ................For sewing lightweight materials PFAFF 571, 591 Model B ................. For sewing medium-weight materials PFAFF 574, 591 Model C ................

  • Page 13: Disposal Of Machine

    Disposal of Machine Disposal of Machine Proper disposal of the machine is the responsibility of the customer. The materials used for the machine are steel, aluminium, brass and various plastic mat- erials. The electrical equipment comprises plastic materials and copper. The machine is to be disposed of according to the locally valid pollution control regula- tions;...

  • Page 14: Transportation, Packing And Storage

    Transportation, packing and storage Transportation, packing and storage Transportation to customer's premises Within the Federal Republic of Germany, complete machines (with table and motor) are delivered without packing. Machines without table (only sewing heads) and machines intended for export are packed. Transportation inside the customer's premises The manufacturer cannot be made liable for transportation inside the customer's premises nor to other operating locations.

  • Page 15: Explanation Of Symbols

    Explanation of symbols Explanation of symbols In this instruction manual, work to be carried out or important information is accentuated by symbols. These symbols have the following meanings: Note, information Cleaning, care Lubrication Maintenance, repairs, adjustment, service work (only to be carried out by technical staff) 6 - 1...

  • Page 16: Controls

    Controls Controls On/off switch Turn the machine on and off by turning switch 1 and pressing switch 2. On machines without edge trimming device –725/.. or –726/.. there is no switch 1. Fig. 7 - 01 Keys on the machine head (only for machines with –911/..) As long as key 1 is pressed during sewing, the machine sews in reverse.

  • Page 17: Bobbin Thread Monitoring With Stitch Counting

    Controls Bobbin thread monitoring with stitch counting Machines without –911/.. Once the preset number of stitches have been sewn, the machines stops. After the thread has been trimmed and the bobbin changed, the stitch counting begins anew. Machines with 911/.. About 100 stitches before reaching the preset number of stitches, LED 1 flashes.

  • Page 18: Lever For Lifting Roller Presser

    Controls Lever for lifting roller presser The roller presser can be raised by turning lever 1. Fig. 7 - 05 Knee lever The roller presser can be raised by pressing the knee lever 1 in the direction of the arrow. Fig.

  • Page 19: Key For Setting Stitch Length

    Controls Key for setting stitch length The stitch length is set by pressing key 1 and turning the balance wheel (see Chapter 9.08 Setting the stitch length). Fig. 7 - 07 Swing out roller presser When the roller presser is raised, it can be swung out by pulling it lightly downwards.

  • Page 20: Edge Trimmer -725/04 For 571

    Controls Edge trimmer -725/04 for 571 Keep your hands away from the moving knife! Danger of injury! Switch on knife drive: Move lever 1 backwards. The knife moves into operating position. Switch off knife drive: Press lever 1. The knife swings backwards.

  • Page 21: Edge Trimmer -725/04 For 574 And 591

    Controls Edge trimmer -725/04 for 574 and 591 Fig. 7 - 10 Keep your hands away from the moving knife! Danger of injury! Switch on knife drive: Move lever 1 backwards. The knife moves into operating position. Switch off knife drive: Press lever 1.

  • Page 22: Edge Trimmer -726/05 For 591

    Controls Edge trimmer -726/05 for 591 Fig. 7 - 11 Keep your hands away from the moving knife! Danger of injury! Switch on knife drive: By turning lever 1 the knife is moved into its operating position. Switch off knife drive: By pressing lever 2 or key 3 the knife is put out of operation.

  • Page 23: Installation And Commissioning

    Installation and commissioning Installation and commissioning The machine must only be installed and commissioned by qualified personnel! All relevant safety regulations must be strictly adhered to! If the machine is delivered without a table, be sure to use a stand and table top that can hold the weight of the machine with its motor.

  • Page 24: Fitting The Tilt Lock

    Installation and commissioning Fitting the tilt lock .01.02 Switch off the machine! Danger of injury if the machine is the machine is started accidentally! Screw on the tilt lock 1, provided in the accessories, using screw 2. Do not operate the machine without tilt lock 1.

  • Page 25: Mounting The Lower V-Belt Guard (Does Not Apply To Machines With Flange Motor)

    Installation and commissioning Mounting the upper V-belt guard .01.04 Screw position stop 1 to the right side of the belt guard 2. Attach the right and left belt guard sections 2 and 3 with screws 4. Slide the slots of the bottom part 5 of the belt guard behind the heads of screws 6.

  • Page 26: Mounting The Synchronizer (Does Not Apply To Machines With Flange Motor)

    Installation and commissioning Mounting the synchronizer .01.06 (does not apply to machines with flange motor) Attach position stop 2 (part no. 91-141 688-90) with two screws. Slide synchonizer 1 onto the shaft so that position stop 2 is located in the groove of synchronizer 1 (see arrow).

  • Page 27: Mounting The Flange Motor

    Installation and commissioning Mounting the flange motor Mounting the flange motor to the bearing plate .02.01 Fig. 8 - 08 Attach bearing plate 1 to motor 2 with screws 3 as shown in Fig. 8 - 08. Remove the wedge from motor shaft 4. Attach angle bracket 5 with screws 6.

  • Page 28: Mounting The Toothed Belt And Adjusting The Tension

    Installation and commissioning Mounting the toothed belt and adjusting the tension .02.03 Fig. 8 - 10 Bring the take-up lever to b.d.c. Turn toothed belt wheel 1 until screw 2 is located in the position shown in Fig. 8 - 10. In this position fit toothed belt 3.

  • Page 29: Connecting The Safety Switch

    Installation and commissioning Connecting the safety switch .02.05 Connect plug 1 of safety switch 2 as shown in Fig. 8-12. When the sewing head is tilted back, the safety switch prevents the machine starting when the main switch is on. To deactivate the safety switch, the main switch must be switched off and then on again...

  • Page 30: Basic Position Of The Machine Drive Unit

    Installation and commissioning Basic position of the machine drive unit Position the needle point flush to the upper edge of the needle plate. Select parameter "700" and adjust it according to the motor service manual. Fig. 8 - 14 Tilted work base 2x dowel pins Ø...

  • Page 31: Table Top Cutout

    Installation and commissioning Table top cutout Screwed insert DIN 7965 (2x) Part no. 12-177 106-05 Stand position Part no. 906-3750-000 8 - 9...

  • Page 32: Commissioning

    Installation and commissioning Commissioning Check the machine, particularly the electrical wiring, for any damage. Clean the machine thoroughly and then oil it or fill in oil (see Chapter 10 Care and maintenance). Have a mechanic check whether the motor of the machine can be operated with the available power supply, and that the motor is correctly connected in the junction box.

  • Page 33: Setting Up

    Loosen screw 2 and insert the needle as far as possible. The long groove must face to the right on model 571 and to the left on model 591. Tighten screw 2 and swing roller presser 1 back into position.

  • Page 34: Inserting The Needle On Model 574

    Setting up Inserting the needle on model 574 Switch the machine off! Danger of injury if the machine is started accidentally! Only use needles of system 134-35. Raise the roller presser 1 and swing it out. Loosen screws 2 and insert the needles so that the long groove of the left needle is facing right, and that of the right needle is facing left.

  • Page 35: Winding The Bobbin Thread; Adjusting The Primary Thread Tension

    Setting up Winding the bobbin thread; adjusting the primary thread tension Fig. 9 - 03 Place an empty bobbin 1 onto bobbin winder spindle 2. Thread the bobbin as shown in Fig. 9 - 03 and wind it clockwise around bobbin 1 a few times.

  • Page 36: Removing/Inserting The Bobbin Case

    Setting up Removing/Inserting the bobbin case Switch the machine off! Danger of injury if the machine is started accidentally! Removing the bobbin case: Open the post cap. Raise latch 1 and remove bobbin case 2. Inserting the bobbin case: Insert bobbin case 2. Close the latch and close the post cap.

  • Page 37: Threading The Needle Thread And Regulating Its Tension On Model 571 And 591

    Tilt up the eye guard 1. Thread the needle thread as shown in Fig. 9-06. On model 571 the needle is threaded from the right to the left, and on model 591 from the left to the right. Adjust the needle thread tension by turning milled screw 2.

  • Page 38: Threading The Needle Thread And Regulating Its Tension On Model 574

    Setting up Threading the needle thread and regulating its tension on model 574 Fig. 9 - 07 Switch the machine off! Danger of injury if the machine is started accidentally! Tilt up the eye guard 1. Thread both needle threads as shown in Fig. 9-07. The left needle is threaded from the right to the left, and the right needle from the left to the right.

  • Page 39: Setting The Stitch Length

    Setting up Setting the stitch length Fig. 9 - 08 Press key 1 and at the same time turn the balance wheel until the stitch setter clicks into position. Hold down key 1 and turn the balance wheel to and fro until the stitch length required is shown on the scale 2 opposite the bottom edge 3 of the belt guard recess.

  • Page 40: Setting The Stitch Counting Function For Bobbin Thread Monitoring

    Setting up Setting the stitch counting function for bobbin thread monitoring Switch on the machine. Press the Parameter input key (LED on). By pressing +/- on key P select the parameter group “760”. By pressing +/- on key L set the number of stitches to be sewn with one bobbin. The value displayed is multiplied by 200 and shown on the left side of the display screen.

  • Page 41: Care And Maintenance

    Care and maintenance Care and maintenance Clean ............daily, more frequently if in continuous operation Oil level (thread lubrication/hook lubrication) ........... daily, before use Oil the hook ..................... daily, before use Lubricate the bevel gears ................once a year Check/adjust air pressure ................ daily, before use Clean air filter of air-filter/lubricator ............

  • Page 42: Oiling The Hook

    If required refill oil through hole. Fig. 10 - 03 Use only oil with a mean viscosity of 22.0 mm /s at 40°C and a density of 0.865 g/cm at 15°C. We recommend PFAFF sewing machine oil Best.-Nr. 280-1-120 144. 10 - 2...

  • Page 43: Filling The Oil Reservoir Of The Thread Lubrication Unit

    There must always be oil in the reservoir 1. If necessary, fill oil up to mark through hole. We recommend PFAFF thread lubricating oil, Order No. 280-1-120 217. Fig. 10 - 04 Oiling the edge trimmer -726/05 All moving parts and bearings marked with arrows in Fig.

  • Page 44: Lubricating The Bevel Gears

    Use both hands to set the sewing head upright! Danger of crushing between the sewing head and the table top! We recommend PFAFF sodium grease with a dripping point of approx. 150C, Order No. 280-1-120 243. 10 - 4...

  • Page 45: Checking/Adjusting The Air Pressure

    Care and maintenance Checking/adjusting the air pressure Before operating the machine, always check the air pressure on gauge1. Gauge 1 must show a pressure of 6 bar. If necessary adjust to this reading. To do so, pull knob 2 upwards and turn it so that the gauge shows a pressure of 6 bar.

  • Page 46: Cleaning The Air Filter Of The Air-Filter/Lubricator

    Care and maintenance Cleaning the air filter of the air-filter/lubricator Switch the machine off! Disconnect the air hose at the air-filter/lubricator. To drain water bowl 1: Water bowl 1 drains itself automatically when the compressed-air hose is discon- nected from the air-filter/lubricator. Cleaning filter 2: Unscrew water bowl 1.

  • Page 47: Adjustment

    Adjustment Adjustment Notes on adjustment All following adjustments are based on a fully assembled machine and may only be carried out by expert staff trained for this purpose. Machine covers, which have to be removed and replaced to carry out checks and adjustments, are not mentioned in the text.

  • Page 48: Adjusting The Basic Machine

    Adjustment Adjusting the basic machine Adjusting the synchronizer (does not apply to machines with flange motor) .04.01 Requirement 1. If sewing is interrupted the machine must position 5 mm before b.d.c. of the needle bar. 2. After “pedal reverse” the machine must position at t.d.c. take-up lever. Fig.

  • Page 49: Needle Position In Sewing Direction On The Pfaff 571 And 591

    Adjustment Needle position in sewing direction on the PFAFF 571 and 591 .04.02 Requirement With the stitch length set at its minimum, the needle should be positioned in the centre of the needle hole, as seen in the direction of sewing.

  • Page 50: Needle Position In Sewing Direction On The Pfaff 574

    Adjustment Needle position in sewing direction on the PFAFF 574 .04.03 Requirement The needle should be positioned in the centre of the needle hole as seen in the direction of sewing. Fig. 11 - 03 Adjust needle bar (screws 1 and 2) according to the requirement.

  • Page 51: Preliminary Adjustment Of The Needle Height

    Adjustment Preliminary adjustment of the needle height .04.04 Requirement When the needle bar is at TDC, there must be a clearance of approx. 22 mm between the needle point and the needle plate. 22 mm Fig. 11 - 04 Adjust needle bar 1 (screw 2), without turning it, according to the requirement. 11 - 5...

  • Page 52: Needle Rise, Hook Clearance, Needle Height And Needle Guard On The Pfaff 571

    Adjustment Needle rise, hook clearance, needle height and needle guard on the PFAFF 571 .04.05 Requirement With the needle bar positioned 2,0 mm after BDC and the stitch length set at "0.8" 1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;...
  • Page 53 Adjustment Adjust hook post according to Requirement 1 and tighten screws 4 and 5. Making sure that there is some play in the bevel gear, tighten screws 1. With retaining collar 7 touching bevel gear 8 tighten screws 2 and 3. Adjust needle guard 6 (screw 9) according to requirement 3.

  • Page 54: Needle Rise, Hook Clearance, Needle Height And Needle Guard On The Pfaff 574

    Adjustment Needle rise, hook clearance, needle height and needle guard on the PFAFF 574 .04.06 Requirement With the needle bar positioned 2,0 mm after BDC on both hooks 1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;...
  • Page 55 Adjustment Adjust needle height according to Requirement 2. Adjust both hook posts according to Requirement 1 and tighten screws 8. Tighten screws 1 and 6. Making sure that there is some play in the bevel gear, tighten screws 3 and 5. With retaining collar 10 touching bevel gear 11 tighten screws 2.

  • Page 56: Needle Rise, Hook Clearance, Needle Height And Needle Guard On The Pfaff 591

    Adjustment Needle rise, hook clearance, needle height and needle guard on the PFAFF 591 .04.07 Requirement With the needle bar positioned 2,0 mm after BDC and the stitch length set at "0.8" 1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;...
  • Page 57 Adjustment Adjust hook post according to Requirement 1 and tighten screws 4. Making sure that there is some play in the bevel gear, tighten screws 2. With retaining collar 7 touching bevel gear 8 tighten screws 1. Adjust needle guard 6 (screw 9) according to requirement 3. When the hook is changed, make sure that the markings 10 and 11 are both on one side.

  • Page 58: Needle Position Crosswise To Sewing Direction On The Pfaff 571

    Adjustment Needle position crosswise to sewing direction on the PFAFF 571 .04.08 Requirement When the stitch length is set at its maximum, the needle must be positioned in the centre of the needle hole when entering and coming out of the needle plate.

  • Page 59: Needle Position Crosswise To Sewing Direction On The Pfaff 574

    Adjustment Needle position crosswise to sewing direction on the PFAFF 574 .04.09 Requirement As seen crosswise to the sewing direction, the needles must penetrate in the centre of their needle holes. Fig. 11 - 09 Shift bearing plate 1 (screws 2, on both sides of the post) according to the requirement.

  • Page 60: Needle Position Crosswise To Sewing Direction On The Pfaff 591

    Adjustment Needle position crosswise to sewing direction on the PFAFF 591 .04.10 Requirement As seen crosswise to the sewing direction, the needle must penetrate in the centre of the needle hole. Fig. 11 - 10 Adjust feed wheel post 1 (screws 2, 3 and 4) according to the requirement.
  • Page 61 Adjust bobbin case opener 1 (screw 2) in accordance with requirement 2. On the PFAFF 574 these adjustments must be repeated on the right post. Depending on the thread size, a variation of the setting in Requirement 2 is permitted.

  • Page 62: Height Of The Feed Wheel On The Pfaff 571

    Adjustment Height of the feed wheel on the PFAFF 571 .04.12 Requirement 1. When pressure is applied to the feed wheel 4, it should protrude from the needle plate by tooth height (approx. 0.8 mm) 2. When no pressure is applied to the feed wheel 4 , it should have a vertical play of approx.

  • Page 63: Height Of The Feed Wheel On The Pfaff 574

    Adjustment Height of the feed wheel on the PFAFF 574 .04.13 Requirement 1. When pressure is applied to the feed wheel 4, it should protrude from the needle plate by tooth height (approx. 0.8 mm) 2. When no pressure is applied to the feed wheel 4 , it should have a vertical play of approx.
  • Page 64 Adjustment Height of the feed wheel on the PFAFF 591 .04.14 Requirement The feed wheel should protrude from the needle plate by tooth height (approx. 0.8 mm) Fig. 11 - 14 Swing out the roller presser. Loosen screws 1. Adjust eccentric 3 (fastening screw accessible through hole 2) according to the requirement.

  • Page 65: Stitch Length Control Eccentric

    Adjustment Stitch length control eccentric .04.15 Requirement When the needle (with maximum stitch length set), coming from TDC, is 3 mm above the needle plate, the crank 3 must have reached its front point of reversal. Fig. 11 - 15 Set the maximum stitch length.

  • Page 66: Stitch Length Scale Disk

    Adjustment Stitch length scale disk .04.16 Requirement When the stitch length control device is locked in position, and the maximum stitch length is set, the marking line of the highest number on the scale disk 1 must be opposite the lower edge 3 of the belt guard recess.

  • Page 67: Shaft Crank To Feed Wheel Drive

    Requirement When the maximum stitch length is set, the linkage rod 3, or linkage rods 3 and 4 on the models 571 and 591, must be able to move freely when the balance wheel is turned. PFAFF 571 PFAFF 591 PFAFF 574 Fig.

  • Page 68: Shaft Crank To Roller Presser Drive

    Adjustment Shaft crank to roller presser drive .04.18 Requirement When the maximum stitch length is set, the linkage rods 3 and 4 must be able to move freely at their left and right point of reversal when the balance wheel is turned. Fig.

  • Page 69: Clearance Between Roller Presser And Feed Wheel

    Adjustment Clearance between roller presser and feed wheel .04.19 Requirement When the presser bar lifter is raised, the clearance between the roller presser and the feed wheel must be 7 mm. Fig. 11 - 19 Raise the presser bar lifter. Adjust the presser bar 1 (screws 2) according to the requirement.

  • Page 70: Roller Presser

    Adjustment Roller presser .04.20 Requirements When the roller presser 1 is touching the feed wheel 5 it must 1. be parallel to feed wheel 5, as seen in the direction of sewing, 2. be in the centre of the needle (on model 574 the left needle), as seen in the direction of sewing, 3.

  • Page 71: Stitch Length On Stitch Length Scale

    When the stitch length is set at "3", and after the needle has entered a strip of leather 11 times, the total length from the first to last needle penetration must be 30 mm. PFAFF 571 PFAFF 591 PFAFF 574 Fig.

  • Page 72: Synchronization Of Roller Presser And Feed Wheel

    Adjustment Synchronization of roller presser and feed wheel .04.22 Requirement After 30 needle penetrations in a strip of leather the total length from the first to the last penetration should be the same, both in the lower and the upper leather layer. Fig.

  • Page 73: Retainer (Only On Model 574)

    Adjustment Retainer (only on model 574) .04.23 Requirements The retainer 1 must 1. be as close as possible to the needle, as seen in the direction of sewing and 2. be in the centre of the needle, as seen crosswise to the direction of sewing. 3.

  • Page 74: Knee Lever

    Adjustment Knee lever .04.24 Requirements 1. Before the roller presser rises, the knee lever must still have a slight play. 2. When the knee lever is raised as far as possible, the lever for the roller presser must drop automatically. 3.

  • Page 75: Needle Thread Tension Release

    Adjustment Needle thread tension release .04.25 Requirements 1. When the presser bar lifter is raised, the tension discs 3 should be pressed at least 0.5 mm apart. 2. When the roller presser is lowered, the tension must be fully effective. 0.5 mm 61-043 Fig.

  • Page 76: Thread Check Spring (Pfaff 571 And 591)

    Adjustment Thread check spring (PFAFF 571 and 591) .04.26 Requirement 1. The movement of thread check spring 7 should be completed when the needle point penetrates the fabric (spring stroke approx. 7 mm). 2. When the largest thread loop is formed while the thread is passed around the hook, the thread check spring 7 should rise slightly from its support Fig.

  • Page 77: Thread Check Springs (Pfaff 574)

    Adjustment Thread check springs (PFAFF 574) .04.27 Requirement 1. The movement of thread check springs 3 and 6 should be completed when the needle points penetrate the fabric (spring stroke approx. 7 mm). 2. When the largest thread loop is formed while the thread is passed around the hook, the thread check springs 3 and 6 should rise slightly from supports 1 and 9.

  • Page 78: Bobbin Winder

    Adjustment Bobbin winder .04.28 Requirements 1. When the bobbin winder is engaged, the winding spindle must be driven reliably. When the bobbin winder is disengaged, the friction wheel 5 must not be moved by drive wheel 1. 2. The bobbin winder must switch itself off, when the filled thread is about 1 mm from the edge of the bobbin.

  • Page 79: Pressure Of Roller Presser

    Adjustment Pressure of roller presser .04.29 Requirement The material must be fed smoothly. No pressure marks should be visible on the material. Fig. 11 - 29 Adjust roller presser pressure with screw 1 according to the requirement. 11 - 33...

  • Page 80: Lubrication

    Adjustment Lubrication .04.30 Requirement After a running time of 10 seconds a fine line of oil should form on a strip of paper held next to the hook. Fig. 11 - 30 Check whether oil has been filled in and that there is no air in the oil lines. Let the machine run for 2-3 min..

  • Page 81: Re-Engage Safety Coupling

    Adjustment Re-engage safety coupling .04.31 The coupling 1 is set by the manufacturer. When the thread jams, the coupling 1 disengages in order to avoid damage to the hooks. A description of how to engage the coupling follows. Fig. 11 - 31 Remove jammed thread.

  • Page 82: Adjusting The Edge Trimmer -725/04

    Adjustment Adjusting the edge trimmer -725/04 Position of the knife holder on model 571 .05.01 Requirements When the thread trimmer is engaged and the adjusting wheel has been turned to its highest position 1. the knife holder 2 must be parallel to the post and 2.
  • Page 83 Adjustment Position of the knife holder on models 574 and 591 .05.02 Requirement When the thread trimmer is engaged, the centre of the angular knife opening must be level with the top edge of the needle plate. Fig. 11 - 33 Switch off the machine and engage the edge trimmer.

  • Page 84: Knife Stroke On Model 571

    Adjustment Knife stroke on model 571 .05.03 Requirement The knife stroke can be adjusted over a range from 1.0 to 3.5 mm, allowing the best possible adaption to all materials used. Fig. 11 - 34 Turn eccentric 1 (screws 2) so that the marking of the desired cutting stroke is opposite the marking on clamp collar 3.

  • Page 85: Knife Stroke On Models 574 And 591

    Adjustment Knife stroke on models 574 and 591 .05.04 Requirement The knife stroke can be adjusted over a range from 2.0 to 3.5 mm, allowing the best possible adaption to all materials used. Fig. 11 - 35 Adjust crank 1 (nut 2) in slotted lever 3 according to the requirement. 11 - 39...

  • Page 86: Cutting Stroke On Model 571

    Adjustment Cutting stroke on model 571 .05.05 Requirement When the edge trimmer is engaged and the needle is in the needle hole, the stroke of knife 1 should be half in front of and half behind the needle, when the motor shaft is turned by hand.

  • Page 87: Cutting Stroke On Models 574 And 591

    Adjustment Cutting stroke on models 574 and 591 .05.06 Requirement When the edge trimmer is engaged and the needle is in the needle hole, the stroke of knife 3 should be half in front of and half behind the needle, when the motor shaft is turned by hand.

  • Page 88: Knife Position

    Adjustment Knife position .05.07 Requirement When the edge trimmer is engaged, the knife should rest lightly on the needle plate insert, but no whistling sound should occur during trimming. Fig. 11 - 38 Adjust screw 1 (screw 2) according to the requirements. Carry out a cutting test and repeat adjustment if necessary.

  • Page 89: Adjusting The Thread Trimmer -726/05 On Model 591

    Adjustment Adjusting the thread trimmer -726/05 on model 591 Position of the knife to the needle plate 06.01 Requirement When the edge trimmer is engaged, the knife 2 must be parallel to the needle plate insert. Fig. 11 - 39 Switch off the machine and engage the edge trimmer.

  • Page 90: Knife Position Crosswise To Sewing Direciton

    Adjustment Knife position crosswise to sewing direction .06.02 Requirement When the edge trimmer is engaged, knife 2 must be vertical and rest lightly on the needle plate insert. Fig. 11 - 40 Switch off the machine and engage the edge trimmer. Bring the knife into a vertical postion by turning milled screw 1.

  • Page 91: Knife Height

    Adjustment Knife height .06.03 Requirement When the edge trimmer is engaged, the centre of the angular knife opening must be at the same height as the upper edge of the needle plate. Fig. 11 - 41 Switch off the machine and engage the edge trimmer. Adjust milled screw 1 according to the requirement.

  • Page 92: Cutting Stroke

    Adjustment Cutting stroke .06.04 Requirement When the edge trimmer is engaged and the needle is in the needle hole, the stroke of knife 3 should be half in front of and half behind the needle, when the motor shaft is turned by hand.

  • Page 93: Knife Stroke

    Adjustment Knife stroke .06.05 Requirement The knife stroke can be adjusted over a range from 1.0 to 3.5 mm, allowing the best possible adaption to all materials used. Fig. 11 - 43 Turn eccentric 1 (screws 2) on the back of the sewing head so that the marking of the desired cutting stroke is opposite marking 3.

  • Page 94: Adjusting The Thread Trimmer -900/81

    Adjustment Adjusting the thread trimmer –900/81 Resting position of the roller lever / radial position of the control cam .07.01 Requirement 1. When the thread trimmer is in is resting position, lever 5 should be touching piston 6 and the roller of roller lever 7 should be 0.3 mm away from control cam 3. 2.

  • Page 95: Position Of The Thread Catcher Holder

    Adjustment Position of the thread catcher holder .07.02 Requirement 1. There should be a minimum amount of play between toothed wheel 3 and toothed segment 4. 2. Both in the neutral position and the foremost position of the catcher, the distance between the toothed segment 4 and the outer edge of the thread catcher holder 1 should be the same (see arrow).

  • Page 96: Distance Between Thread Catcher And Needle Plate

    Adjustment Distance between thread catcher and needle plate .07.03 Requirement During its swivel movement thread catcher 1 should not pass the edge of the needle plate (see arrow). Fig. 11 - 46 Move thread catcher 1 (screws 2, two screws) parallel to the thread catcher holder in accordance with the requirement.

  • Page 97: Position Of The Thread Catcher

    Adjustment Position of the thread catcher .07.04 Requirement 1. The bottom edge of thread catcher 1 must be at a distance of 0.1 mm from the positioning finger of the bobbin case 3. 2. When the thread trimmer is in its resting position, the back edge of the thread catcher should be approx.

  • Page 98: Knife Position And Knife Pressure

    Adjustment Knife position and knife pressure .07.05 Requirement 1. The knife 1 should be touching the needle plate. 2. The knife pressure should be set as low as possible but the cutting operation should still be carried out reliably. 61-109 Fig.

  • Page 99: Bobbin Thread Retaining Spring

    Adjustment Bobbin thread retaining spring .07.06 Requirement 1. The bobbin thread clamp spring should be guided reliably in the thread groove of the thread catcher 3. 2. The tension of the bobbin thread spring clamp should be as low as possible, but the bobbin thread should be held reliably after the cutting operation.

  • Page 100: Manual Cutting Test

    Adjustment Manual cutting test .07.07 Requirement 1. When thread catcher 1 is on its forward stroke, it must not carry bobbin thread 3 forward too. 2. When thread catcher 1 is in its front position, bobbin thread 3 must be held reliably by hook 4.

  • Page 101: Releasing The Tension

    Adjustment Releasing the tension .07.08 Requirement When the magnet is activated, tension discs 3 must be at least 0.5 mm apart. 0.5 mm 61-043 Fig. 13 - 51 Activate the magnet. Detach the tension bearing plate 1 and adjust pressure plate 2 in accordance with the requirement.

  • Page 102: Linkage Rod (Only For The Pfaff 574)

    Adjustment Linkage rod (only for the PFAFF 574) .07.09 Requirement When the thread trimmer is in its resting position, the drive levers 1 must be parallel. Fig. 11 - 52 Adjust drive levers 1 (screws 2) in accordance with the requirement.

  • Page 103: Adjustment Of Backtacking Mechanism -911

    Adjustment Adjustment of backtacking mechanism -911/.. Needle in needle hole (only for PFAFF 571 and 591) 08.01 Requirement When the maximum stitch length is set, the needle must be the same distance from the inside edge of the needle hole, both for forward and reverse stitch.

  • Page 104: Coupling For Roller Presser Drive

    Adjustment Coupling for roller presser drive .08.02 Requirement There must be a distance of 3 mm between coupling half 1 and locking disc 3 of the drive mechanism. Fig. 11 - 54 Adjust coupling half 1 (screw 2) according to the requirement. 11 - 58...

  • Page 105: Bevel Gears For Feed Wheel Drive (On The Pfaff 571 And 574)

    Adjustment Bevel gears for feed wheel drive (on the PFAFF 571 and 574) .08.03 Requirements 1. Bevel gear 3 must fit well on the left side. 2. There must be a distance of 14 mm between bevel gear 3 and bevel gear 5.

  • Page 106: Bevel Gear Play (On The Pfaff 571 And 574)

    Adjustment Bevel gear play (on the PFAFF 571 and 574) .08.04 Requirements 1. When sewing forwards, there must be a slight play between bevel gears 6 and 7. 2. When sewing backwards, there must be a slight play between bevel gears 6 and 8.

  • Page 107: Bevel Gears For Feed Wheel Drive (On The Pfaff 591)

    Adjustment Bevel gears for feed wheel drive (on the PFAFF 591) .08.05 Requirements 1. The right side of bevel gear 1 must be flush with its drive shaft (see arrow). 2. There must be a distance of 13 mm between bevel gear 3 and bevel gear 1.

  • Page 108: Bevel Gear Play (On The Pfaff 591)

    Adjustment Bevel gear play (on the PFAFF 591 .08.06 Requirements 1. When sewing forwards, there must be a slight play between bevel gears 6 and 7. 2. When sewing backwards, there must be a slight play between bevel gears 6 and 8.

  • Page 109: Parameter Settings

    Adjustment Parameter settings Following parameters can be set on the control panel using the display: Group Parameter Significance Setting Standard value l = yes ll = no Max. speed 100 - 2800 2800 Cutting speed 1 30 - 300 Bobbin thread monitoring 0 - 2 0 = without 1 = with sensor...

  • Page 110: Wearing Parts

    Wearing parts Wearing parts This list indicates the most important wearing parts. You can request a detailed parts list for the complete machine under parts number 296-12-18 461. PFAFF 571, 574, 591 13-033 148-05 91-176 329-05 11-178 172-15 11-210 043-15...
  • Page 111 12-315 080-15 (2x) 11-108 846-15 (2x) 91-263 348-05 91-263 139-05 11-108 093-15 (2x) 91-263 294-05 99-137 151-45 91-171 049-05 91-171 042-05 571-725/04 574-725/04; 591-725/04 591-726/05 11-130 167-15 91-175 180-15 11-173 168-15 91-119 202-04/001 91-011 165-04/001 91-011 324-04/003 12 - 2...

  • Page 112: Circuit Diagrams

    Circuit diagrams Reference list for the circuit diagrams Quick controller OC TOP operating panel Starting capacitor knife motor Sewing lamp LED stitch counting Relay knife motor Sewing motor Knife motor On/off switch Transformer knife motor Outputs 900/..thread trimmer 910/..automatic presser foot lift 911/..backtacking mechanism Thread tension Inputs...
  • Page 113 91-191 443-95 General plan – circuit diagrams Part1 Version 20.04.01 13 - 2...
  • Page 114 General plan – circuit diagrams 91-191 443-95 Version 20.04.01 Part 2 13 - 3...
  • Page 115 Notes...
  • Page 116 PFAFF Industrie Maschinen AG Postfach 3020 D-67653 Kaiserslautern Königstr. 154 D-67655 Kaiserslautern Telefon: (0631) 200-0 Telefax: (0631) 17202 E-Mail: info@pfaff-industrial.com Gedruckt in der BRD Printed in Germany Imprimé en R.F.A. Impreso en la R.F.A.

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574591

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